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Contactless tonometer

A non-contact, tonometer technology, applied in tonometer and other directions, can solve the problems of high cost and difficult installation of solenoid valves, and achieve the effect of compact equipment

Active Publication Date: 2014-01-01
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Large solenoid valves are costly and difficult to fit in limited spaces in equipment
This creates a barrier to using the above method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0030] figure 1 is a diagram showing a schematic configuration of a non-contact tonometer according to the present invention.

[0031] The frame 102 is movable in a horizontal direction (hereinafter referred to as an X-axis direction) relative to the base 100 . The drive mechanism on the X-axis direction includes an X-axis motor 103 fixed on the base 100, a feed screw (not shown) that is connected to the output shaft of the motor, and is fixed in a manner that can move along the X-axis direction on the feed screw. Nut to box 102 (not shown). The motor 103 rotates to move the frame 102 in the X-axis direction by feeding the screw and the nut.

[0032] The frame 106 is movable in a vertical direction (hereinafter referred to as Y-axis direction) relative to the frame 102 . The driving mechanism on the Y-axis direction includes a Y-axis motor 104 fixed on the frame 102, a feed screw 105 connected to the output shaft of the motor, and a motor that is fixed on the frame 106 in a...

no. 2 example

[0091] Usually, in a structure that determines the movement start position of the piston 40 as in the case of conventional products, in order to shorten the air injection time for the eye to be inspected, a hole for air discharge is formed near the middle of the cylinder 43 .

[0092] Since the air in the cylinder 43 is not compressed until the piston 40 passes through the hole, the piston 40 increases its drive speed without any air resistance and starts to compress the air while passing through the hole. Assume that the piston 40 is driven by the same force. In this case, if the initial velocity at the start time of air compression is high, the velocity of air jetted against the subject's eye is correspondingly high. This shortens the time to reach the pressure required for the measurement. The configuration according to the first embodiment has disadvantages in that a hole cannot be formed in the cylinder and an initial velocity of the piston 40 at the start of air compres...

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PUM

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Abstract

The invention provides a contactless tonometer. In a contactless tonometer having a mechanism of puffing compressed air by moving a piston in a cylinder, puffing of unnecessary air against the eye to be inspected is suppressed. An apparatus includes a corneal shape changing unit configured to change a shape of a cornea of an eye to be inspected by compressing air in a cylinder by using a piston, and puffing the compressed air from the nozzle to the cornea, a piston control unit configured to control operation of the piston, and an intraocular pressure measurement unit configured to measure an intraocular pressure of the eye by detecting a state of a changed shape of the cornea. This apparatus includes a piston volume changing unit configured to change an initial volume when the piston compresses the air in the cylinder.

Description

technical field [0001] The present invention relates to a non-contact tonometer that calculates an intraocular pressure value based on a corneal shape change signal obtained by an optical detection unit when the corneal shape is changed by jetting air against an eye to be inspected. Background technique [0002] The non-contact tonometer is typified by the air jet tonometer developed by Bernard Grolman. This tonometer optically detects applanation of the cornea when air is sprayed on the cornea of ​​the subject's eye from a nozzle about 11 mm away from the cornea. Then, the contact Goldman type tonometer calculates the intraocular pressure value by calibrating the time until applanation. Many tonometers of this type use a mechanism that compresses the air in the cylinder by moving a piston inside the cylinder attached to the air injection nozzle section and ejects the air from the nozzle. In addition, the driving mechanism of the piston generally uses a solenoid because th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B3/16
CPCA61B3/165
Inventor 土桥康浩
Owner CANON KK
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